/*
 * Copyright 2018- The Pixie Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

package tar

import (
	"archive/tar"
	"io"
)

// ReadTarFileFromReader writes the file contents to a map where the key is the name
// of the file and the value contains its contents.
func ReadTarFileFromReader(r io.Reader) (map[string]string, error) {
	tarReader := tar.NewReader(r)

	fileMap := make(map[string]string)

	for {
		header, err := tarReader.Next()
		if err == io.EOF {
			break
		}
		if err != nil {
			return nil, err
		}
		if header.Typeflag == tar.TypeReg {
			fileMap[header.Name], err = readFileToString(tarReader)
			if err != nil {
				return nil, err
			}
		}
	}
	return fileMap, nil
}

func readFileToString(tr *tar.Reader) (string, error) {
	buf, err := io.ReadAll(tr)
	if err != nil && err != io.EOF {
		return "", err
	}
	return string(buf), nil
}
